Abstract: The purpose of the present invention is to improve the reliability of a power conversion system while reducing the size. In addition, the purpose of the present invention is to reduce noise. This power conversion system has a first power converting device that supplies power to a first motor and a second power converting device that supplies power to a motor different from the first motor, wherein the first power converting device and the second power converting device are each provided with a power converter for converting the power to be supplied to the motors, and a control unit for controlling the power converter, and the first power converting device is provided with a transformer unit for supplying power to the control units, and the transformer unit of the first power converting device supplies power to the control unit in the second power converting device.

Abstract: Present systems and methods are directed to a ride system that includes a personal electronic device (PED) holding system for a ride vehicle. The PED holding system includes a lock that is configured to move from an unlocked configuration to a locked configuration to lock a PED of a passenger of the ride vehicle to the ride vehicle during a ride cycle. The PED holding system also includes a charging system that is configured to charge an energy storage component of the PED during the ride cycle.

Abstract: A motor drive control apparatus includes a receiving unit configured to receive a target rotation frequency outputted to a motor to be a drive control target of a predetermined plurality of motors from a host apparatus and receive stability information indicating that actual rotation frequencies of the predetermined plurality of motors are stabilized, an advance angle/duty determination unit configured to adjust a drive control signal to control driving of the motor to be a drive control target so that a motor current becomes minimum at the target rotation frequency when the stability information is received, a duty setting unit, an advance angle control unit, a energization controlling unit and a motor drive unit configured to drive the motor to be the drive control target based on the drive control signal.

Abstract: A motor driving device controls braking of multiple motors each having a braking device by using a single brake power supply. The braking device includes: an electromagnetic brake that releases braking of a rotary shaft of the motor by energizing a brake coil; a conductive disk configured to rotate together with the rotary shaft and connected in series with the brake coil; and a plurality of resistors provided on a surface of the disk so as to be periodically connected in series with the brake coil as the disk rotates. The motor driving device identifies a failed braking device of the braking devices, based on the current value of the current flowing from the brake power supply and the rotational positions of the rotary shafts of the multiple motors.

Abstract: The embodiments describe programmable peripheral units for use in a building automation system. The program-mable peripheral units communicate with controllers and other system components. The programmable peripheral units have end device components to actuate the building environment.

Abstract: An actuator in a HVAC system includes a motor and a drive device driven by the motor. The drive device is coupled to a movable HVAC component for driving the movable HVAC component between multiple positions. The actuator includes an input connection configured to receive an input signal and a processing circuit coupled to the motor. The processing circuit is configured to determine whether the input signal is an AC voltage signal or a DC voltage signal. The processing circuit is configured to operate the motor using an AC motor control technique in response to determining that the input signal is an AC voltage signal and configured to operate the motor using a DC motor control technique in response to determining that the input signal is a DC voltage signal.

Abstract: A servomotor control system of the present invention includes: a multiple number of first servomotors for driving axes in a machine tool or others; a multiple number of converters for converting AC voltage into DC voltage; a multiple number of first inverters for converting DC voltage into AC voltage; second servomotors for rotating inertial bodies; a multiple number of second inverters for converting DC voltage into AC voltage; and a servomotor control unit for controlling the multiple first servomotors and the second servomotors, and is constructed such that the number of the second servomotors is less than that of the multiple second inverters, and at least one of the second servomotors includes a multiple number of independent windings, and at least part of the multiple second inverters are connected to the multiple independent windings provided for one of the second servomotors.

Abstract: A power device of an electric vehicle according to the present invention includes an electricity storage device which stores electricity of direct current, an inverter device which generates alternating current from the direct current stored in the electricity storage device, multiple electric motors which receive supply of electricity of the alternating current generated by the inverter device and generate a traveling driving force, and a driving force transmission mechanism which transmits rotation of each output shaft portion of the multiple electric motors to a driving wheel. The driving force transmission mechanism is configured such that rotation of each output shaft portion is transmitted to the driving wheel with an equal speed change ratio, and the multiple electric motors are connected to a single inverter device, and configured to receive electricity supply of the alternating current generated by the single inverter device.

Abstract: Control circuits and related methods are provided. One exemplary control circuit includes a solid state switching device for coupling to a first tap of a motor and a control device coupled to the solid state switching device. The control device is configured to switch the solid state switching device to apply a signal to the first tap in response to a demand for operation of the motor at a second parameter to operate the motor at the second parameter. The control device is also configured to switch the solid state switching device to apply a signal to the first tap in response to a demand for operation of the motor at a first parameter to operate the motor at the first parameter.

Abstract: Provided is a battery charge circuit including a charging power supply unit configured to generate an internal voltage using an external power supply; a charging unit configured to measure voltages of first to fourth batteries, output measurement signals, and selectively charge at least one among the first to fourth batteries in response to charge control signals; and a control unit configured to select charging methods corresponding to the measurement signals among a plurality of charging methods stored therein, and generate the control signals corresponding to the charging methods.

Abstract: Provided is a battery charge circuit including a charging power supply unit configured to generate an internal voltage using an external power supply; a charging unit configured to measure voltages of a plurality of batteries, output measurement signals, and selectively charge at least one among the plurality of batteries in response to charge control signals; and a control unit configured to select charging methods corresponding to the measurement signals, and generate the control signals corresponding to the charging methods.

Abstract: A power system housed in one or more modules or containers may be located as a unitary structure where desired, for example secured to a locomotive platform, allowing easy retrofits. A control subsystem may maintain an RPM of a prime mover at minimum that still provides an expected level of power from an electric machine for any one of a finite number of throttle settings. The control subsystem may dynamically adjust loads between various combinations of series and/or parallel couplings. A set of processor executable instructions may be configured for specific platforms by selecting appropriate set of values based on number of loads (e.g., driven axles), rating (e.g., horse power), other criteria (e.g., manufacturer, model, year). Characteristics may be determined and verified, and operation based on the outcome of such. A telematics system method logs and provides remote access to operational data, engine data, power system data, anti-idling overrides, unauthorized changes, and/or location.

Abstract: To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate advance angle value corresponding to the speed of the motor that is set can be automatically set. The motor control circuit according to the present invention includes an advance angle setting means that adds a reference advance angle value to an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount and outputs an advance angle setting signal, and an advance angle setting correction means that uses a ratio of a correction reference period relative to a period of a reference signal input from the outside as a correction amount and corrects the reference advance angle value by an advance angle correction value obtained by multiplying the correction amount by a predetermined proportional coefficient of the advance angle setting means.

Abstract: A system and method for multi-media experience capture and data transfer includes a system for transferring data including a first wireless communication system located on a moveable amusement attraction, a second wireless communication system located on the moveable amusement attraction, and logic to operate the first wireless communication system and the second wireless communication system based on a changeable parameter of the moveable amusement attraction.

Abstract: Route guidance devices, methods, and programs provide guidance for a vehicle that is provided with a drive motor and an engine as drive sources. The devices, methods, and programs acquire a departure point and a destination for the vehicle and specify one or more motor drive recommended links for which driving with the drive motor as the drive source is recommended. The devices, methods, and programs specify a route that includes only motor drive recommended links and by which the vehicle can drive from the departure point to the destination using only the drive motor as the drive source and output the specified route on a display.

Abstract: Disclosed is an electric power consumption control system for a factory where a plurality of machine tools (Mi, Mp1, Mp2) are installed. A machine tool (Mi) is provided with a control device (10) whereby either the rotational acceleration/deceleration (Pi) for the motor for the machine tool and/or the rotational speed (Si) thereof is controlled on the basis of information regarding electric power consumption (Wt) in the factory so that electric power consumption will not exceed a specified value (We). This electric power consumption control system is also provided with electric power detection instruments (11, 12, 13) and an electric power monitoring instrument (20) which measure the electric power consumption of all the machine tools installed in the factory, thereby obtaining the electric power consumption of the factory, and provide information regarding the electric power consumption to the control device of the machine tool equipped with the control device.

Abstract: In a motor control system, a controller generates a single control signal for a motor control unit in a first electric motor and another motor control unit in a second electric motor. The motor control units in the first and second electric motors operate the first and second electric motors at a first rate in response to the control signal being at a first level. The motor control unit in the first electric motor operates the first electric motor at a second rate and the motor control unit in the second electric motor operates the second electric motor at a third rate in response to the control signal being at a second level, the third rate being different than the second rate.

Abstract: To provide a disk drive capable of inhibiting the occurrence of acoustic noise caused by a voltage pulse when the head is retracted using a speed control method using voltage obtained by rectifying a back electromotive force after the power source has been cut off from the rotation of a spindle motor. Retraction control circuit is used to control the on and off modes of transistors in accordance with the speed of VCM. The voltage across VCM becomes a voltage that can be regulated with VCM voltage control circuit. At this time, voltage is supplied to the terminals based on the voltage of ISO5V that is the rectified voltage of the back electromotive force of the spindle motor and the pulsating voltage is synchronized and produced at both terminals. As a result, the potential difference across VCM is such that the pulsating voltage is negated and acoustic noise is inhibited.

Abstract: A fan control system includes a first fan, a second fan adjacent to the first fan, a first motor that rotates the first fan, a second motor that rotates the second fan, and a control unit. The control unit controls the rotational speeds of the first motor and the second motor. The control unit decreases the rotational speed of the first motor and increases/decreases the rotational speed of the second motor when the rotational speed of the first motor must be decreased. The control unit can decrease the rotational speed of the second motor when the rotational speed of the first motor whose rotational speed has been decreased is lower than a prescribed rotational speed, and increase the rotational speed of the second motor when the rotational speed of the first motor whose rotational speed has been decreased is higher than the prescribed rotational speed.

Abstract: The present invention provides a power supply device for an electric vehicle that allows highly efficient operation of a compressor inverter.

Abstract: The present invention relates to a system for controlling rotational speed on a rotating process machine (P), which for example is a turbine or a propeller, where the rotating process machine (P) is connected to at least one motor (M1) and arranged to rotate with a given rotational speed given by the motor (M1), the motor (M1) is connected to a control system (C) and the rotational speed of the motor (M1) is arranged to be controlled by a control system (C). The rotating process machine (P) comprises a load control (PC) arranged to be adaptable, the control system (C) is connected to the rotating process machine (P). With the invention, one achieves soft transitions between several selectable rotational speeds and lower energy consumption by step by step adjusting the size and the rotational speed of the motor (M1) to varying energy requirement.

Abstract: A fan speed control circuit includes a first fan, a second fan, a first temperature sensor, a second temperature sensor, a PWM regulator, and a driving module. The first temperature sensor senses a temperature of the first component to generate a first temperature signal. The second temperature sensor senses a temperature of a second component to generate a second temperature signal. The PWM regulator is connected to the first temperature sensor and the second temperature sensor. The PWM regulator generates a first PWM signal according to the first temperature signal and generates a second PWM signal according to the second temperature signal. The driving module is connected to the PWM regulator. The driving module generates a first driving voltage provided to the first fan according to the first PWM signal. The driving module also generates a second driving voltage provided to the second fan according to the second PWM signal.

Abstract: To provide a disk drive capable of inhibiting the occurrence of acoustic noise caused by a voltage pulse when the head is retracted using a speed control method using voltage obtained by rectifying a back electromotive force after the power source has been cut off from the rotation of a spindle motor. Retraction control circuit is used to control the on and off modes of transistors in accordance with the speed of VCM. The voltage across VCM becomes a voltage that can be regulated with VCM voltage control circuit. At this time, voltage is supplied to the terminals based on the voltage of ISO5V that is the rectified voltage of the back electromotive force of the spindle motor and the pulsating voltage is synchronized and produced at both terminals. As a result, the potential difference across VCM is such that the pulsating voltage is negated and acoustic noise is inhibited.

Abstract: A dual mode battery charging system and method of use are provided for use in an electric vehicle. The system utilizes at least two user selectable, charging operational modes. In a first operational mode, a state of charge circuit powers on the engine/generator system whenever the battery state of charge falls below a first level and until the battery state of charge reaches a second level, where the second level is higher than the first level. In a second operational mode, the state of charge circuit powers on the engine/generator system whenever the battery state of charge falls below a third level and until the battery state of charge reaches the second level, where the third level is lower than both the first and second levels.

Abstract: A dual mode battery charging system and method of use are provided for use in an electric vehicle. The system utilizes at least two user selectable, charging operational modes. In a first operational mode, a state of charge circuit cycles an engine/generator system on/off between a first level and a second level, where the second level is higher than the first level. In a second operational mode, the state of charge circuit cycles the engine/generator system on/off between a third level and a fourth level. After the fourth state of charge has been reached once, the state of charge circuit cycles the engine/generator system on/off between a fifth level and the fourth level, where the fifth level is higher than the third level and lower than the fourth level, and where the fourth level is lower than both the first and second levels.

Abstract: A vehicle includes an engine, a motor, a belt, and a controller. The engine is configured to output torque via a crankshaft. The motor is configured to apply torque to and/or receive torque from the engine via an output shaft. The belt is operably disposed on the crankshaft of the engine and the output shaft of the motor. Rotation of the output shaft is transferred to the crankshaft via the belt. The controller is configured to identify a slip event by comparing a speed of the motor to a speed of the engine. The controller is further configured to count the number of slip events and diagnose a belt failure if the number of slip events exceeds a predetermined number of slip events over a predetermined number of drive cycles.

Abstract: An electric toothbrush is disclosed. The toothbrush includes a housing; a brush; an electric motor for driving the brush; a power supply for providing the electric power required for operation of the toothbrush; a switch mechanism for turning the drive on and off; and an electronic circuit for adjusting the effective voltage (UMot) applied to the electric motor. In operation, a voltage supplied by the power supply declines with the discharge status of the power supply from a high-voltage range to a low-voltage range. During operation of the toothbrush in the high-voltage range (H), the effective voltage (UMot) applied to the electric motor is lowered to a level at which the electric motor has reached a rotational speed corresponding essentially to the rotational speed of the electric motor in the medium-voltage range.

Abstract: A dual mode battery charging system and method of use are provided for use in an electric vehicle. The system utilizes at least two user selectable, charging operational modes. In a first operational mode, a state of charge circuit powers on the engine/generator system whenever the battery state of charge falls below a first level and until the battery state of charge reaches a second level, where the second level is higher than the first level. In a second operational mode, the state of charge circuit powers on the engine/generator system whenever the battery state of charge falls below a third level and until the battery state of charge reaches a fourth level, where the fourth level is higher than the third level, and where both the third and fourth levels are lower than both the first and second levels.

Abstract: One embodiment includes a method that includes monitoring a battery state of charge circuit that is coupled to a vehicle battery, calculating an averaged value of the state of charge over a time period, charging the vehicle battery by powering a generator with a fuel burning engine that powered on and powered off according to one of a first operational mode and a second operational mode, wherein in the first operational mode the engine is powered on when the battery state of charge drops below a first state of charge and continues until the averaged value of the state of charge increases to a first preprogrammed value.

Abstract: A method, computer readable medium, and system for controlling velocity of an at least partially resonant actuator system in accordance with embodiments of the present invention includes determining with an actuator controller computing device a sequence of full bridge and half bridge outputs to control an output velocity of an at least partially resonant actuator device. The actuator controller computing device controls a driver system to output a driving signal based on the determined sequence of full bridge and half bridge outputs. The driver system provides the driving signal to the at least one at least partially resonant actuator device.

Abstract: An arrangement for supplying power to a system includes a first electric drive unit constructed to supply mechanical power to or receive mechanical power from a first coupled system of machines and a second electric drive unit constructed to supply mechanical power to or receive mechanical power from a second coupled system of machines. The first and second coupled system of machines are constructed to receive mechanical power or mechanical energy or to supply mechanical power or mechanical energy. The arrangement further includes a first kinetic energy storage device having a first electrical energy exchange machine which is electrically connected to the first electric drive unit, and a second kinetic energy storage device having a second electrical energy exchange machine which is electrically connected to the second electric drive unit. The first kinetic energy storage device is coupled to the second kinetic energy storage device.

Abstract: An actuator system for assisting extension of a biological joint is provided with a motor assembly, a rotary-to-linear mechanism, and an extension stop. The rotary-to-linear mechanism includes a screw that accepts rotational output of the motor assembly, and a nut that cooperates with the screw to convert rotational movement of the screw to linear movement of the nut. The extension stop is driven by linear movement of the nut in an extension direction to cause extension of the biological joint. The motor assembly, the rotary-to-linear mechanism and the extension stop cooperate to allow unpowered flexion of the joint. The system is configured without a flexion stop, and is configured such that the nut cannot drive the joint in a flexion direction. Methods of use are also disclosed.

Abstract: A drive system of an electrically driven dump truck is capable of achieving an operational feeling in which the operation amount of the accelerator pedal is well balanced with the output horsepower of the electric motors, particularly at the time of slow traveling. To achieve this, the target motor output horsepower Pm0 corresponding to the operation amount of an accelerator pedal 1 is calculated. The target motor torque Tr1R, Tr1L is calculated on the basis of the target motor output horsepower Pm0 and the rotational speed ?R, ?L of electric motors 12R, 12L respectively. The acceleration torque limit values of the electric motors 12R, 12L corresponding to the operation amount of the accelerator pedal 1 are calculated, respectively. Then, smaller values are selected, as motor torque instruction values TrR, TrL, between the acceleration torque limit value and the target motor torque Tr1R, Tr1L to control inverters 73R, 73L, respectively.

Abstract: A traction drive system comprising a plurality of electric motors selectably connected to a main shaft by engagement devices, each motor or combination of motors provides distinct performance characteristics along a broad spectrum of performance characteristics; and a method of managing a traction drive system including sensing physical parameters of the fraction drive system, selecting an electric motor having well-suited performance profile based on pre-selected criteria against which the sensed parameter is compared, and engaging one or more of the corresponding motors to the main shaft.

Abstract: A system and method for driving a drawer of a refrigerator and a refrigerator employing this system is provided. This system and method allows the drawer to substantially immediately and automatically stop when the drawer encounters an obstacle. This type of automatic control of the drawer may enhance the safe operation of the drawer, prevent injuries to users, and prevent overload and subsequent malfunction of a drive motor used to move the drawer.

Abstract: An information handling system includes a processor, memory coupled to the processor, a cooling fan, and a controller coupled to the processor and configured to control the speed of the cooling fan based on the operation of the memory. The processor is configured to determine a user-selected performance setting for the information handling system; determine a fan speed limit corresponding to the user selected performance setting; limit the speed of the cooling fan based on the determined fan speed limit; and in connection with limiting the speed of the cooling fan, control an operational parameter of the memory to reduce cooling demands generated by the memory.

Abstract: A stepping motor controlling device includes first and second clock signal generators, plural drivers, and a controller. The first clock signal generator generates a reference clock signal for rotationally driving of plural stepping motors. The second clock signal generator generates, on the basis of the reference clock signal, for each of the stepping motors, speed control clock signals. The plural drivers are provided respectively for the stepping motors and, on the basis of the speed control clock signals for the respective stepping motors, generate pulse excitation signals and input the pulse excitation signals to the stepping motors to rotationally drive the stepping motors. The controller controls the second clock signal generator to generate the speed control clock signals such that phases of the respective speed control clock signals for the stepping motors differ from one another.

Abstract: A precharge circuit (20, 20?, 20?) charges at least one capacitor (22, 22?, 22?) associated with an electrical device with high capacitance, such as a motor (14) which drives a compressor (16) of the pneumatic system. One end of the at least one capacitor is connected with a high voltage bus (10). The other end of the at least one capacitor is connected by at least one charge limiting resistor (24, 24?, 24?) with a low reference node. When the at least one capacitor is charged at least to a preselected level, a control circuit (28, 28?, 28?) controls a switch (26, 26?, 26?) to bypass the current limiting resistor. In this manner, the current limiting resistors limit the surge current to charge the capacitors. Once the capacitors are charged, the resistors and their associated heat dissipation are removed from the circuit and only ripple current from across the capacitors flows through the switch reducing a required current carrying capacity and needed heat sinking for the switch.

Abstract: A motor controller is provided. The motor controller includes a motor drive unit that drives a plurality of motors; a thermal shutdown unit that is provided in the motor drive unit and that stops the plurality of motors in the case of an overload; a lock signal generation unit that generates a lock signal corresponding to a respective one of the plurality of motors when a rotational speed of the respective motor reaches a threshold speed set for the respective motor; and an operation determination unit which, when the lock signal generation unit interrupts lock signals for all of the plurality of motors, determines that thermal shutdown unit has operated.

Abstract: A traction drive system comprising a plurality of electric motors selectably connected to a main shaft by engagement devices, each motor or combination of motors provides distinct performance characteristics along a broad spectrum of performance characteristics; and a method of managing a traction drive system including sensing physical parameters of the fraction drive system, selecting an electric motor having well-suited performance profile based on pre-selected criteria against which the sensed parameter is compared, and engaging one or more of the corresponding motors to the main shaft.

Abstract: The present invention relates to a method for ensuring a constant target speed of a battery driven electrical motor, the battery driven electrical motor being adapted to move a piston rod in an injection device so as to inject a set dose of medicine from the injection device, the method comprising the steps of setting a first target speed to be reached by the motor, determining whether the first target speed can be reached, and, if the first target speed can be reached, maintaining the first target speed until a set dose of medicine has been injected from the injection device, or if the first target speed cannot been reached, setting a second target speed.

Abstract: The present invention provides a motor drive system that is substantially more robust than those of the prior art. Generally, the motor drive system provides a redundant communication topology with the drives, thereby greatly reducing the chance of failure by a fault in the drive-to-drive communication link. Specifically, the motor drive system includes a plurality of motor drives joined by a communication media. Each motor drive has a motor control circuit configured to control the speed of an electric motor and a media access control unit having two communication modules. Each communications module includes a transmitter and a receiver joined to the communications media. A set of routing switches in the media access control unit joins the communication modules to connect the motor drives in an independent primary and a secondary ring communicating data for controlling the motor drives.

Abstract: A field-oriented control method for an electric drive comprising a plurality of electric motors, for implementing a tension mechanism, especially for load cable and/or gearing means, using measurements of a polyphase motor actual current. The measured values are transformed into a direct current component and a quadrature current component, based upon a magnetic rotor field or flux angle, in a rotor flux-based d,q coordinate system. The quadrature and direct current components from the actual current are subjected to a comparison with predetermined quadrature and direct current components of a current command value.

Abstract: A motor control processor is provided for motor phase current sampling of multiple variable frequency controlled electric motors, and includes an analog-to-digital (A/D) converter and a controller. The A/D converter has multiple analog inputs and generates a digital output signal in response to the multiple analog inputs. The controller is coupled to the A/D converter and determines a maximum desired switching frequency for a first one of the multiple variable frequency controlled electric motors. The controller further selects a base period in response to the maximum desired switching frequency and defines a phase shift time delay as a fraction of the base period so the controller may control the multiple analog inputs of the A/D converter to sample motor phase currents of each of the multiple variable frequency controlled electric motors at sample times determined by the controller in response to the base period and the phase shift time delay.

Abstract: An apparatus and method for servomotors of an electric injection molding machine includes a motion controlling unit, two driving amplifying units, and two servomotors respectively connected to the driving amplifying units. The motion controlling unit includes two servomotor position controllers both for receiving a first position command, and the driving amplifying units are respectively connected to the servomotor position controllers for receiving a second and third position command. Two position detectors are respectively received in the two screw caps that are mounted to the servomotors for detecting absolute positions of the corresponding screw caps. The screw caps are respectively connected to inputs of the first and second servomotor position controllers to form two screw cap position feedback circuits.

Abstract: A motor driving device according to the present invention includes: a serial communication unit that conducts communication through a serial communication bus, the serial communication bus including a serial data line through which serial data is transmitted and a clock line through which a clock signal is transmitted; and a drive control unit that controls a driving operation of a motor. The motor driving device is configured such that a clock signal received from the serial communication bus is used as a reference clock signal of the drive control unit.

Abstract: A drive system for an electrically driven dump truck is capable of enabling electric motors for traveling to make full use of the output horsepower of the prime mover up to an output limit of the prime mover. A target motor horsepower corresponding to an operation amount of an accelerator pedal is calculated and an available maximum horsepower for the electric motors out of the maximum output horsepower of the prime mover is calculated in response to the actual revolution speed of the prime mover. The horsepower coefficient corresponding to the instantaneous revolution speed deviation is calculated. The available maximum horsepower for the electric motors is modified by the horsepower coefficient to determine a second target motor horsepower. The target motor horsepower is limited to not exceed the second target motor horsepower so as to control the torque of the electric motors.

Abstract: A method of controlling a web in, for example, a web cutter that minimizes the destructive forces that are experienced by the web. The method includes providing a motor system for driving a web handling mechanism structured to move the web, wherein the motor system includes a motor and a motor control subsystem having a digital filter (such as a PID controller or some other suitable closed loop controller), detuning the digital filter, and using the motor system having the detuned digital filter to drive the web handling mechanism.

Abstract: Systems and/or methods that facilitate efficiently controlling speed of an induction motor are presented. An optimized control component controls respective switching of an auxiliary switch component associated with an auxiliary winding of the motor, a main switch component associated with a main winding of the motor, and a capacitance adjuster switch component that facilitates adjusting the amount of capacitance associated with the auxiliary winding. The timing of switching on the auxiliary switch component and main switch component can be controlled such that there can be a time difference between the respective switching on of the auxiliary switch component and main switch component to produce additional phase shift to facilitate improving motor efficiency. The capacitance adjuster switch component can be switched on when motor speed is below a predetermined low speed threshold to facilitate increasing the amount of capacitance associated with the auxiliary winding to improve motor efficiency.

Abstract: An electric car control apparatus with which it is possible to make the size of equipment small. The control apparatus includes current detectors for respectively detecting currents flowing through collector shoes mounted on a leading car; a no-current indicator for outputting a no-current signal when the currents detected by these current detectors are zero; a no-current train line for transmitting the no-current signal to the following car; and disconnection timer mounted on each of the cars for, when inputting a speed signal and a no-current signal, in correspondence with the speed of the cars outputting a disconnection signal for causing a connector to disconnect after a predetermined time such that it is possible to determine that there is a dead section or gap.